x = set('hello world')
print(x)
print(type(x))

A = {1, 2, 3, 4, 5}
B = {3, 4, 5, 6, 7}
print(A ^ B)
print(B ^ A)
A_sydi_B = A.symmetric_difference(B)
B_sydi_A = B.symmetric_difference(A)
print(A_sydi_B)
print(B_sydi_A)
print(A_sydi_B == B_sydi_A)
print(A - B)
print(A.difference_update(B))
print(A)
